Optimization of multidimensional cross-section tables for few-group core calculations

Sánchez-Cervera Huerta, Santiago; García Herranz, Nuria; Herrero Carrascosa, José Javier y Cabellos de Francisco, Oscar Luis (2014). Optimization of multidimensional cross-section tables for few-group core calculations. "Annals of Nuclear Energy", v. 69 (n. null); pp. 226-237. ISSN 0306-4549. https://doi.org/10.1016/j.anucene.2014.02.013.

Descripción

Título: Optimization of multidimensional cross-section tables for few-group core calculations
Autor/es:
  • Sánchez-Cervera Huerta, Santiago
  • García Herranz, Nuria
  • Herrero Carrascosa, José Javier
  • Cabellos de Francisco, Oscar Luis
Tipo de Documento: Artículo
Título de Revista/Publicación: Annals of Nuclear Energy
Fecha: Julio 2014
Volumen: 69
Materias:
Palabras Clave Informales: Tabulated cross sections library; Optimization; Grid point distribution
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Ingeniería Energética
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Multigroup diffusion codes for three dimensional LWR core analysis use as input data pre-generated homogenized few group cross sections and discontinuity factors for certain combinations of state variables, such as temperatures or densities. The simplest way of compiling those data are tabulated libraries, where a grid covering the domain of state variables is defined and the homogenized cross sections are computed at the grid points. Then, during the core calculation, an interpolation algorithm is used to compute the cross sections from the table values. Since interpolation errors depend on the distance between the grid points, a determined refinement of the mesh is required to reach a target accuracy, which could lead to large data storage volume and a large number of lattice transport calculations. In this paper, a simple and effective procedure to optimize the distribution of grid points for tabulated libraries is presented. Optimality is considered in the sense of building a non-uniform point distribution with the minimum number of grid points for each state variable satisfying a given target accuracy in k-effective. The procedure consists of determining the sensitivity coefficients of k-effective to cross sections using perturbation theory; and estimating the interpolation errors committed with different mesh steps for each state variable. These results allow evaluating the influence of interpolation errors of each cross section on k-effective for any combination of state variables, and estimating the optimal distance between grid points.

Proyectos asociados

TipoCódigoAcrónimoResponsableTítulo
Gobierno de EspañaP110530207CSNSin especificarSpanish Nuclear Safety Council (CSN)
FP7EC/FP7/323263/EUNURESAFESin especificarCollaborative Project NURESAFE

Más información

ID de Registro: 35635
Identificador DC: http://oa.upm.es/35635/
Identificador OAI: oai:oa.upm.es:35635
Identificador DOI: 10.1016/j.anucene.2014.02.013
URL Oficial: http://www.journals.elsevier.com/annals-of-nuclear-energy/
Depositado por: Memoria Investigacion
Depositado el: 22 Sep 2015 14:11
Ultima Modificación: 23 Dic 2015 07:52
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